Current filter for radios



Jan. 27, 1931. N. GYMNAITIS CURRENT FILTER FOR RADIOS Filed June 13. 1928 1a 'to ea Patented Jan. '27, 1831 m111a! 's'ra'rss' PATENT- OFFICE mm emu'ris, or m'ranamna. cnnanrrmmronnamos k a Application fled June 18,

- invention i's "an electric current filter for radios and the like. 1 Anobject ofm invention is a current filter suitable for radios, which is arranged-with l a series of coils connected in aseries and preferably with each of the coils formed of I a plurality of la of wire; and in addition preferabl I t e wires being twisted relativetoeacho er. I v

l A further object of-my invention is the employment in connection with the filter coils of condensers which may be connected to the ground; and in this connection I preferably use a plair of condensers, one being connected 0 of the wires forming opposite sides of. the circuit and the condensers being connectedby a common lead to the ground.

My present invention may be considered as 7 an improvement on my patent application for lo a Current filter and static mufller for radios,

-.-Serial'-No. 271,959,.fi1ed 4pri1 18, 1928. My

' present invention is particularlyadapted for use with alternating current radio sets utilizthe alternating current directly from a:

as fig socket.

y invention is illustrated in the accompanying drawings, in which:

n Fig. 1 is a horizontal section on the line.

11 of Fig. 2 in the direction of the arrows, .Fig. 2 is an interior elevation of the structure of Fig. 1 with the casing broken and internal arts broken away,

Fig. 3 is an electrical diagram showing arrangement of coils, condensers and circuit for a simple connection,-

1 Fig. 4 is a wiring diagram showinga plurality of coils with-the condensers connected therein. f

Referring first to Fig. 3 thisillustrates a plu 11 which may be-connected to an alterna current c1rcuit. This has lead wires .12 an 13. The lead wire 12 is-illustraited as having'a connection-14 m one side of the condenser 15 and thelead wire 13 has a connection 16t0' one side of .the condenser 17;

' indicated at 25. I

38' mounted on the spool.

1m. lerlal Io. acacia. V o

The opposite sides of each of these condensers are connectedb a common connection- 18 and this connection' has a lead 1910 the ground 20.

' The lead wires a coil 2lwhich is preferably made of twisted wires, this coil being wound one cylindrical spool 22. .The wires end at;a terminal 23 and a have a connection 24 to a radio receiving set I In Figs. 1 and 2I show my invention in a commercialized form, in which I use a box structure 26 preferably with cylindrical side walls 27, 9, base 28 ans removable cap 29.

Iv also have apartition 30 between the side 0:

walls, and the cylindrical core or spool 31 is mounted onthis partition as are the two condensers 32 and 33. p r

A plug 34 is, connected to the lead wires35 and 36. I employ two bindin lglposts 37 and 66' v e wire 35 is illustrated as conncted to the post 38 ,and the wire 36 to the post 37. From the binding post 37 thereis a connection 39 to one side there is a wire 40 to one side of the condenser 33. These condensers have a common conmotion 41 at the top and a lead wire 42 fromthis connection to a socket 43 in a socket plate 44 mounted on-the cover. This isadapt- 76.

ed to receive a plug connected to the-ground. I illustrate the l as having an inner nect to the middle coil and from the middle 86 i coil to the outer coil so that these coils are connected in series. The outgoing wires 4 from the outer coil are connected to binding '51 and 52 and these binding posts have 9 1' I wires 53 and 54 to the sockets {55 and 56 0 12 and 13 are connected to so i of the condenser 32 andlfrom the post 38 in the socket plate- 44. The wires 24 are de- I signed to be connected to these sockets an from thence tothe radio set. .In Fig. 4 I show an arrangement using a plurality of distinct coils. These are mounted on an elongated spool 57 with a lower coil 58, a middle coil 59 and an up er coil 60, each of these coils being forme of twisted wires and having connecting leads 61 and 62 between the lower and the middle coil and the. middle and the upper coil. Eachof these coils is made up of a plurality of layers in a similar manner to the construction of Fig. 2. The condensers are positioned inside of the spool 57, the lead 'wires being connected to binding posts at the bottom of the core and having a connection to the condensers and to the lowermost coil. The condensers at the top are connected to a common binding post and from this to ground, and the uppermost coil has an output connection to a radio set. With my type of current filter the twisted wires have a condenser action and offer a rebined functions, that of giving sistance, that is they provide a capacitance and resistance. Therefore when the wires are formed into a coil, have the two comv a resistance and a capacitance in the circuits.

Various changes may be made in the principles of my invention without departing from the spirit thereof, as set forth in the description, drawings and claims.

I I claim:

1. A current filter comprising in combination a pair of input wires adapted to be connected to an alternating current source of power, a pair of output wires adapted to connect to a radio set, a coil formed of two wires twisted on themselves connecting the input and output wires, and a'condenser connected to each of the wires, each condenser having a common ground connection, the said twisted wires forming a capacitance and resistance.

2. A current filter comprising in combination' a pair of input wires adapted for connection to an alternatin current source of power, an output pair of wires adapted for connection to a radio set, a plurality of coils each having two wires twisted on themselves, the coils beiiig'connected in series, the first set of coils being connected to the input pair pf wires and the last coil to the output'pair of wires, and a condenser connected to each of the wires prior to the first coil, each of the condensers being connected to a ground, the said twisted wires forming a capacitance and resistance.

3. 'A current filter comprising inxsombination a hollow spool having an inner coil formed of a-p'air of wires twisted -on them- .selves and a plurality of separate'coils of wire twisted on themselves positioned out.-

side of the first coil, said coils being connected in series, a leadconnectionfrom the and from the last coil to a radio set, a con-' denser connected to each side of the circuits so formed, and a ground connection from each of the condensers, the said twisted wires forming a capacitance and resistance.

4. A current filter comprising incombination a tubular spool having an inner coil formed of a pair of wires twisted on them- .selves, a plurality of outer .coils of wire twisted on themselves positioned on the inner coil and insulated therefrom, said coils being connected in series, a pair of lead wires connecting the first coil to an alternating current source of power, a pair of wires leading from the outermost coil to a radio set, a pair of condensers mounted inside the spool, a wiring connection from the binding posts to each condenser, a common connection from each condenser to a ground, and a pair of output wires connected to the outermost coil and adapted to connect to a radio set.

6. A current filter as claimed in claim 5, the spool having a pair of upper binding posts, the wires from the last coil 'bein connected to said posts and the wires to t e set being-connected to the same posts.

7. A current filter comprising anhousing having a'tu'bu1ar spo0l mounted therein, an

inner coil formed of two wires twisted on themselves on the spool, a plurality of outer coils formed of two wires twisted on themselves positioned outside of the first coil, each coil being insulated from the other coils, a pair of lower binding posts on the spool, a

pair of input wires connected from said posts extending outside of the housing, a connection from the binding posts .to the first coil,

a pair "of upper binding. posts on the spool,

a connection from the outermost coil to the upper posts,

housing, the output wires connected jrom thenpper posts to a pair ofsockets- 11mm,

a pair of condensers positioned insid ofthe spool, a wire from each of the lower posts to from each condenser to the "pair of wiresleading to the firstlcoil, and a a socket plate connectedto the a condenser, and a common connection from.

the condensers to a socketin'the socket late.

8. A current filter comprising in com 'ination a tubular spool having aplurality of distinct and separate coils thereon, each formed of two wires twisted on themselves, posi name to this tioned longitudinally of the spool, each being formed of a plurality of separate insu coil lated layers in series and each of the coils being arranged in series, a pair of condensers mounted in the spool, a pairof in ut wires each having a connection to one o the condensers and to opposite wires of the coils, the condensers having a common connection to the ground and the wires of the coils each having an output-connection to a radio set, the said twisted wires forming a capacitance and resistance.

In testimony whereof I have signed my specification. NICHOLAS GYMNAITIS. 

